public class LocalParamBlock extends Instruction
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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LocalParamBlock(LocalParamSetter[] params)
Create the block of parameters
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| Modifier and Type | Method and Description |
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int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
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Expression |
copy()
Copy an expression.
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void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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int |
getCardinality()
Determine the cardinality of the expression
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LocalParamSetter[] |
getChildren()
Get the children of this instruction
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the LocalParamBlock expression
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String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
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int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by this expression
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Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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TailCall |
processLeavingTail(XPathContext context)
ProcessLeavingTail: called to do the real work of this instruction.
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protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites.
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression.
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions.
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assembleParams, assembleTunnelParams, computeCardinality, createsNewNodes, dynamicError, evaluateAsString, evaluateItem, getConstructType, getInstructionName, getInstructionNameCode, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, promoteaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, iterateSubExpressionInfo, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitgetColumnNumber, getLineNumber, getPublicId, getSystemIdpublic LocalParamBlock(LocalParamSetter[] params)
params - the parameterspublic String getExpressionName()
InstructiongetExpressionName in class Instructionpublic LocalParamSetter[] getChildren()
public int computeSpecialProperties()
InstructioncomputeSpecialProperties in class Instructionpublic Iterator<Expression> iterateSubExpressions()
ExpressioniterateSubExpressions in class Expressionpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class Expressionoriginal - the original subexpressionreplacement - the replacement subexpressionpublic Expression copy()
copy in class Expressionpublic final ItemType getItemType(TypeHierarchy th)
getItemType in class Instructionth - the type hierarchy cachepublic final int getCardinality()
getCardinality in class Expressionpublic Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify in class Instructionvisitor - an expression visitorXPathException - if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
ExpressionThis method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)protected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst in class Instructionoffer - The type of rewrite being offeredXPathExceptionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structurepublic TailCall processLeavingTail(XPathContext context) throws XPathException
InstructionprocessLeavingTail in interface TailCallReturnerprocessLeavingTail in class Instructioncontext - The dynamic context of the transformation, giving access to the current node,
the current variables, etc.XPathException - if a dynamic error occurs during the evaluation
of the instructionpublic int getImplementationMethod()
getImplementationMethod in class InstructionExpression.ITERATE_METHOD or Expression.EVALUATE_METHOD or
Expression.PROCESS_METHODpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.